From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <dev-bounces@dpdk.org>
Received: from dpdk.org (dpdk.org [92.243.14.124])
	by inbox.dpdk.org (Postfix) with ESMTP id 0A1B3A04B5;
	Wed, 30 Sep 2020 15:12:37 +0200 (CEST)
Received: from [92.243.14.124] (localhost [127.0.0.1])
	by dpdk.org (Postfix) with ESMTP id 9C0A01DB83;
	Wed, 30 Sep 2020 15:08:40 +0200 (CEST)
Received: from mga18.intel.com (mga18.intel.com [134.134.136.126])
 by dpdk.org (Postfix) with ESMTP id 0AE831DB44
 for <dev@dpdk.org>; Wed, 30 Sep 2020 15:08:24 +0200 (CEST)
IronPort-SDR: kQa7KCYebNYTwsViF9Oz6XIO15xGL/9lvo6HDU+IN1JSvP4hLN6/O58kSirBcrcCvtlbHBqt2N
 QpIJDB5EMCtQ==
X-IronPort-AV: E=McAfee;i="6000,8403,9759"; a="150223489"
X-IronPort-AV: E=Sophos;i="5.77,322,1596524400"; d="scan'208";a="150223489"
X-Amp-Result: SKIPPED(no attachment in message)
X-Amp-File-Uploaded: False
Received: from fmsmga008.fm.intel.com ([10.253.24.58])
 by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384;
 30 Sep 2020 06:08:23 -0700
IronPort-SDR: oibkUHzkZC9DqYke/Qa1mm/zKiFHhUSdJ9bdtIVkjFypAGFAT5aJ3pMxviCFoOW82ScujHfvrX
 jK3bfcPVZAnA==
X-ExtLoop1: 1
X-IronPort-AV: E=Sophos;i="5.77,322,1596524400"; d="scan'208";a="294603259"
Received: from silpixa00399953.ir.intel.com (HELO
 silpixa00399953.ger.corp.intel.com) ([10.237.222.53])
 by fmsmga008.fm.intel.com with ESMTP; 30 Sep 2020 06:08:21 -0700
From: Ciara Power <ciara.power@intel.com>
To: dev@dpdk.org
Cc: Ciara Power <ciara.power@intel.com>,
 Maxime Coquelin <maxime.coquelin@redhat.com>,
 Chenbo Xia <chenbo.xia@intel.com>, Zhihong Wang <zhihong.wang@intel.com>
Date: Wed, 30 Sep 2020 14:04:09 +0100
Message-Id: <20200930130415.11211-14-ciara.power@intel.com>
X-Mailer: git-send-email 2.17.1
In-Reply-To: <20200930130415.11211-1-ciara.power@intel.com>
References: <20200807155859.63888-1-ciara.power@intel.com>
 <20200930130415.11211-1-ciara.power@intel.com>
Subject: [dpdk-dev] [PATCH v3 13/18] net/virtio: add checks for max SIMD
	bitwidth
X-BeenThere: dev@dpdk.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: DPDK patches and discussions <dev.dpdk.org>
List-Unsubscribe: <https://mails.dpdk.org/options/dev>,
 <mailto:dev-request@dpdk.org?subject=unsubscribe>
List-Archive: <http://mails.dpdk.org/archives/dev/>
List-Post: <mailto:dev@dpdk.org>
List-Help: <mailto:dev-request@dpdk.org?subject=help>
List-Subscribe: <https://mails.dpdk.org/listinfo/dev>,
 <mailto:dev-request@dpdk.org?subject=subscribe>
Errors-To: dev-bounces@dpdk.org
Sender: "dev" <dev-bounces@dpdk.org>

When choosing a vector path to take, an extra condition must be
satisfied to ensure the max SIMD bitwidth allows for the CPU enabled
path.

Cc: Maxime Coquelin <maxime.coquelin@redhat.com>
Cc: Chenbo Xia <chenbo.xia@intel.com>
Cc: Zhihong Wang <zhihong.wang@intel.com>

Signed-off-by: Ciara Power <ciara.power@intel.com>

---
v3: Moved max SIMD bitwidth check to configure function with other vec
    support checks.
---
 drivers/net/virtio/virtio_ethdev.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index 013a2904e6..f749e81405 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -2306,7 +2306,8 @@ virtio_dev_configure(struct rte_eth_dev *dev)
 		if ((hw->use_vec_rx || hw->use_vec_tx) &&
 		    (!rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX512F) ||
 		     !vtpci_with_feature(hw, VIRTIO_F_IN_ORDER) ||
-		     !vtpci_with_feature(hw, VIRTIO_F_VERSION_1))) {
+		     !vtpci_with_feature(hw, VIRTIO_F_VERSION_1) ||
+		     rte_get_max_simd_bitwidth() < RTE_MAX_512_SIMD)) {
 			PMD_DRV_LOG(INFO,
 				"disabled packed ring vectorized path for requirements not met");
 			hw->use_vec_rx = 0;
@@ -2359,6 +2360,12 @@ virtio_dev_configure(struct rte_eth_dev *dev)
 					"disabled split ring vectorized rx for offloading enabled");
 				hw->use_vec_rx = 0;
 			}
+
+			if (rte_get_max_simd_bitwidth() < RTE_MAX_128_SIMD) {
+				PMD_DRV_LOG(INFO,
+					"disabled split ring vectorized rx, max SIMD bitwidth too low");
+				hw->use_vec_rx = 0;
+			}
 		}
 	}
 
-- 
2.17.1